[Roadman]

There isn't an official timeframe but from what I've seen, companies do tend to stop searching for activity usage after a month of no activity. I've done a refund myself and was foolish enough to use it straight away. 2 weeks later it got remotely locked.

WiFi also is a no-go. Some say its fine but it isn't worth the risk. Just wait several weeks.

Ipads, laptops etc with WiFi only are fine to use straight away.

You're welcome.